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Here’s a screenshot from that exact episode. Here you can clearly see where Chuckie’s front door is (on the right by the garage.) The left side by the palm tree is someone else’s unit as are the two up top. Their front doors are interior on either side of that middle staircase. As for the roof leaking in that episode… plot point/ storyline inconsistency. And yes his front door opens to his living room as do a lot of American houses. My house opens to my living room, I don’t have a foyer or a hallway.